Metals and nonmetals, Economic importance of some metals & nonmetals

Metals and non - metals

Every day, we can see the matter around us which has a mass and a volume. The matter may exist as an element or a compound, The element is the simplest form of matter that can not be analyzed into two substances or more.

The elements
There are 112 elements.

118 elements have been discovered up till now. and they are divided into the natural elements (they are 92 elements) and artificial elements (they are 26 elements).

The elements are composed of small particles known as the molecules which are composed of atoms.

The elements molecules are formed of similar atoms that are different from those of the other elements.

The scientists classified the elements according to their properties into the metals and the non-metals.

The metals

The metals are solids except mercury which is liquid. Solid metals as copper, aluminium, lead, gold and silver.

The properties of the metals

  1. The metals are shiny. and they have metallic luster if they are pure.

  2. They are good conductors of electricity.

  3. They are good conductors of heat.

  4. They have high melting and boiling point.

  5. They can be bent, They are malleable, and they can be hammered to form sheets.

The non-metals 

They are solids such as sulphur, carbon, and phosphorous. They are liquids such as bromine, and they are gases such as oxygen and nitrogen.

The properties of the non-metals
  1. They do not have a metallic luster, They are not shiny.

  2. They are not malleable or they can not be hammered. They can not be bend.

  3. They are bad conductors of the heat.

  4. They are bad conductors of electricity except carbon.

  5. They have low melting and boiling points.

  1. Metals and non metals properties
    The difference between metals and non-metals.
Some metals and non-metals economic importance

Iron is very important in making bridges, the car chassis (the car frames), the doors and the sheet lights (The lamp posts), and it is a metal.

Copper is very important in making electric wires, statues and metallic coins, and it is a metal.

Aluminium is very important in the manufacture of cooking pans, foil paper, and some doorknobs, And it is a metal.

Gold and silver are used in making jewellery, and they are metals.

Carbon (graphite) is used in making the positive electrodes (The poles) of the dry batteries (the cells), and it is non-metal.

Mercury metal is used in making of thermometers.

You can download Science online application on google play from this link: Science online Apps on Google play

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